A child born at 36 weeks developed difficulty in breathing with intercoastal recession and nasal flaring. His temp is normal but his mother had PROM 48 hours ago. What is the most likely investigation that will lead to treatment?

The key is A. Blood culture. [In neonates investigations of pneumonia is for sepsis as pneumonia at this age is always secondary to sepsis or a part of sepsis. Probable diagnosis is Neonatal Pneumonia as there is respiratory signs and history of PROM. In extremes of age pneumonia or sepsis may be with normal temperature or even there may be hypothermia. Here pneumonia is a part of sepsis and investigation is not CXR but blood culture!].